[Autofill] Minor style cleanup.

BUG=none
TEST=none
R=estade@chromium.org

Review URL: https://codereview.chromium.org/137663009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249883 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249883